Calculating-machine.



E. C. WALTER.

CALCULATING MACHINE.

' APPLICATION FILED JULY 6.191].

1 ,224,872. Patented May 1, 1917.

I0 SHEETS-SHEET l.

E; C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULY 6,1911.

Patented May 1, 1917.

10 SHEETS-SHEET 2 avwemto'o E. C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULYG. 19H.

Patented May 1, 1917.

10 SHEETS-SHEET 3 E. C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULY 6,1911.

Patented May 1, 1917.

10 SHEETS-SHEET 4 E. C. WALTER.

CALCULATING MACHINE.

APPLICATION FKLED JULY6.19I1- awue/wtoz MINI,

wi/lmwoeo E. C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULY 6.1911.

Patented May 1, 1917.

10 SHEETS-SHEET 6.

E. C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULY 6.1911.

1,224,872. Patented May 1, 1917.

10 SHEETS-SHEET 7- mt uowms PETERS co" nwmu'mo wAsnmcmm 0. c.

E. C. WALTER.

CALCULATING MACHlNE.

APPLICATION FILED JULY 6.191%.

1,224,872. Patent-ed May1,1917;

SHEETSSHEET 8.

E. C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULY 6.191].

IIIIIIIIIIIIIIIIII-IIIIIIIIIIIIIIIII Patented May 1, 1917.

10 SHEETS-SFEET 9 l I v V Ill- 'll II II -I I II II II II E, C. WALTER.

CALCULATING MACHINE.

APPLICATION FILED JULY 6. 19:1.

Patented May 1, 1917.

10 SHEETS-SHEET 10 UNITED STATES PATENT OFFICE.

EDWARD C. WALTER, OF NEW YORK, N. Y., ASSIGNOB TO HARRY T. AMBROSE, OF ORANGE, NEW JERSEY.

CALCULATING-MIACHINE.

Specification of Letters Patent.

Patented May 1, 1917.

Application filed July 6, 1911. Serial No. (537,199.

To all whom "Lt may concern:

Be it known that T, EDWARD C. lVALTnn, a citizen out the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Calculating-Machines, of which the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates to calculating machines and especially calculating machines adapted to be used in conjunction with typewriting machines.

In one aspect, the invention has for its object the provision of a calculating machine adapted to be suitably mounted upon a part of the typewriting machinewhich may be of any required construction or make-so that, as requisite, he numbers imprinted upon the work-sheet whether it be a billing form, a columned page of a book, or of other formmay be added or subtracted on dials or number-wheels so arranged as to be conveniently visible to the operator, said numeral-keys being so connected with the calculating machine that any one of them may be operated without actuating the parts of the calculating machine except as may be desired.

The invention also has for its object an arrangement of the connections between the numeral-keys and the calculating attach ment whereby only an actuation of the selecting-mechani'sm, which forms a part of the structure constituting the calculating machine, shallbe eliiected when any one or another of the nun'ieral-lreys is depressed by the operator, there being a mechanism provided for independently actuating said selecting mechanism to effect a computation; so that, to the end that each numeralkey shall be required to do a minimum amount of work additional to its usual operation as an actuating medium for the typebar, the connections of the numeral-keys and the calculating mechanism are peculiarly arranged, first, in order that no part of the calculating mechanism shall be operated by the numeral-keys when it is not desired to add or subtract and, secondly, when the calculating mechanism is to be operated, only part of said mechanism shall be actuated as includes the selecting-mechanism, wherefore, upon the depression of a numeral-key, only slight additional work is imposed upon that numeral-key in actuating said selecting part of the calculating mechanism, the remaining part of said mechanism depending for its operation upon the actuation of other mechanism to effect the necessary computation.

The invention has also for its object the provision of mechanism by which the actua tion of the number-wheels or dials is effected by means which are controlled by but which are actuated independently of the numeral-keys, provision being made, as stated, in independent mechanism to 'etl ect successive actuation of the parts of the calculating mechanism and, thus, of the successive number-wheels or dials in the operation of? adding or subtracting.

In another aspect of the invention, it includes means for actuating the parts of the calculating mechanism whereby said mechanism is readily converted from an adding machine into a subtracting machine, the actuation ofthenecessary parts, devices and mechanisms for effecting this change being under the control, preferably, of a single device conveniently arranged on the calculating machine and operating, with certainty and ease, to shift the parts, as may be required, to make the desired conversion. 7

A further object of the invention is to provide, in such a machine, instrumentalities for resetting any one or more of the denominational actuating members in case of a mistakeand for resetting all of the number-w ieels or dials to composition, and this whether the machine is, for the moment, being used as an adding machme, or as a subtracting machine.

The present invention is, in part, founded upon the subject-matter disclosed and claimed in United States Patent No. 963,727, granted July 5th, 1910, upon my invention, and includes certain parts, mechanisms and instrumentalities therein disclosed, with additional parts. mechanisms and instrumentalities essential to the adaptation of the machine as a subtracting machine: The machine constituting the subject-matter of the aforementioned patent is adapted to effect a computation by addition, only. My present construction is, therefore, a carry ing forward of the structure devised by me for performing the function of computation by addition, and includes such changes in the form of the parts and such additional parts and mechanisms as are required, first, to convert the mechanism for effecting a computation, by addition, into a mechanism for effecting a computation, by subtraction, and the provision, in such a machine, of means for Controlling the several parts of the mechanism whereby the necessary positioning of the same may be conveniently effected to convert the mechanism from an adding machine into a subtracting machine, or vice versa.

My present invention, similarly as with that forming the subject-matter of the aforementioned patent, comprehends a calculating machine which may be positioned upon certain parts of a flat-platen typewriter, though it is to be understood that the machine may be equally well adapted for use in the so-called round platen class of typewriting machines. In illustrating the machine as adapted to the first-mentioned class of machines, therefore, it is to be understood that I do not restrict the use of my present invention to that class of machines. Where it is to be attached to the so-called flat-platen class of machines, I prefer to dispose one portion of the attachment upon the linespacing carriage of the machine, and the other accompanying portion upon the letterspacing carriage thereof. The particular position of the component parts of the machine, in so far as afiects the disposition of the one part upon one particular carriage and the other upon the other carriage, is not peculiarly essential to my invention. I find, however, in the practical use of the machine, that the best results are secured by positioning, upon the line-spacing carriage, the component part of the calculating machine which includes the computer-casing and (what I herein shall refer to as the) computer-component selecting mechanism, and dispose the other component part, which I shall herein designate the carriagecomponent selectingmechanism on the letterspacing carriage. In this arrangement, the computer is relatively stationary, Whereas the carriage-component selecting-mechanism has a traveling movement in relation to said computer. The carriage-component and computer-component selecting mechanisms, either or both, as referred to in the claims, will be included in the general designations selecting mechanism and selecting means: Therefore, wherever I herein refer to selecting means or selecting mechanism, generally, it will be understood as including one or the other, or both of these component mechanisms.

In employing the terms calculating attachment, calculator, computer, etc., I refer to and intend to include all such machines as come under the various titles of adding machine, register, co-mputer, computing mechanism, calculator, accumulator, totalizer, and the like.

In the present invention, the same as in my patented invention, the printing or numeral-keys operate only the selecting mechanism to bring certain instrumentalities in the computer into position with reference to an independent operating mechanism, also in the computer, which is then operated to effect a computation and a movement of the denominational wheels of the computer to disclose the results of the computation.

In the present invention, in arranging the parts for cooperative operation, I have constructed them with a View to simplicity and, also, for a certainty of operation whereby overthrow of any of the parts, under the action 01- momentum thereof, shall not occur and, thus, produce an incorrect computation; and, to this end, have included instrumentalities for insuring the proper position of any one or more parts preliminary to its actuation, and, also, the positive holding of other parts against movement during the actuation of any one or more instrumentalities whose actuation might disturb the position of that part and thus produce an inaccuracy in the computation.

In the accompanying drawings I have illustrated an embodiment of the invention, by way of example, and at this point desire it to be understood that, in exemplifying such an embodiment, I am by no means speeifically claiming or restricting myself to that particular form, since other embodiments, adapted to perform the functions and to secure the results for which the illustrated embodiment is designed, are within the spirit of my invention.

In these drawings:

Figure l is a view in perspective of the calculating attachment or computer comprising a housing and means for attaching it to any desired part of a typewriting machine;

Figs. 1 and 1 are fragmentary and sectional views thereof;

Fig. 1 is a detail view of a carriage-detent device;

Fig. 2 is a fragmentary view in perspective of that part of the construction which is connected to the numeral-keys, and which constitutes, with the keys, the carriage-component selecting mechanism and whereby the computer-component selecting-mechanism of the computer is actuated and positioned;

Fig. 3 is an aggrouped detail view of the several turn-buckles of the key-lever connections, showing the different lengths;

Fig. 4 is a sectional elevation of the mechanisms of the computing machine and including a portion of the key-actuated devices appearing in Fig. :2, the parts appearing in the position they occupy when set for subtracting and after a key-lever has actuated the selecting-mechanism and just after the initiation of the operation of the actuposition and actuated the mechanisms which control the operation'of the number-wheel;

Fig. 6 is a view similar to Fig. 5 showing the actuating element somewhat advanced in its 4 cycle of movement for operating the mechanism which controls the numberwheel in the operation of effecting a computation;

Fig. 6 is a view of a modified form of cam-disk;

Fig. 7 is a fragmentary view of the mechanism for controlling the position of the parts whereby the same may be moved into one or another of a plurality of positions to effect a computation, either by addition, or by subtraction, or into a non-producing or neutral; position Fig. 8 is a sectional elevation of the same;

Figs. 9, l0 and 11 are fragmentary views in sectional elevation showing the computation-controlling parts in the positions they assume when actuated, first, to effect a computation by subtraction; secondly, to effect a computation by addition; and, thirdly, when rendered inactive for the non-production of any computation;

Fig. 12 is a detail view of a pinion-carrying member, the position of which, relative to the carrying mechanism, and the number-wheel actuating instrumentalities determines the position or movement of the numher-wheel;

Fig. 13 is a fragmentary view in perspective illustrating particularly the parts which control the carrying mechanism;

Fig. 14 is a fragmentary view in elevation showing certain of the cooperative parts constituting the carrying mechanism of the computer;

Fig. 15 is a detail view of a star-wheel or disk forming another part of the carrying mechanism;

Fig. 16 is a similar view of the toothed or ratchet-wheel similarly forming a part of the carrying mechanism;

Fig. 17 is a detached view showing parts of the carrying mechanism and, also, the devicefor returning the number-wheels and the adjunctive parts for controlling the same, to zero-position;

Fig. 18 is a fragmentary view showing, on an enlarged scale, a form of device for in suring the proper position of parts of the computer component selecting mechanism preparatory to being actuated to effect a computation Fig. 19 is a fragmentary view in perspective of certain of the parts illustrated in Fig. 18, a portion. of the same being omitted and other portions being broken away more clearly to show the cam-surface and the parts which co-act therewith; and i Fig. 20 is a fragmentary view in perspective of a modified form of device for resetting the selecting mechanism.

Referring more specifically to the drawings, the numeral 1 designates, generally, the calculator mounted on parts, which may be designated generally by the numerals and 3, of the line-spacing carriage of a Donning machine, here shown in part merely for convenience of illustration of the present invention, but which appears more fully in the aforementioned Patent No. 963,727. Mounted to travel horizontally on the line-spacing carriage of such a machine, is a letter-spacingcarriage, of which the top plate 4 appears in Figs. 2 and 4, and which constitutes a support for the carriage-component selecting mechanism, interposed between the printing-keys, on the one part, and the computer-component selecting-mechanism, on the other part, and which latter is housed within the casing 1, as will more fully hereinafter appear.

For clearness of description and convenient reference, I shall now proceed to describe my invention under three general headings, to-wit:

1. Carriage computer nism.

2. Compi[tor-component selecting-mechanism.

3. Computing mechanism.

Under the first and second headings, 1 propose to describe, briefly. the mechanisms utilized to make a selection; and, under the third heading, the mechanism whicl --the selecting-mechanism having been positioned is operated by actuating mechanism to effect a computation.

As my machine is adapted to effect a comselecting mechaputation, both by addition and subtraction,

shall separately describe the structure as operating as an adding mechanism, as a subtracting mechanism, and, then, as a non producing mechanism.

1. 0 arrz'age-c01np0ncmf sclccting-mechanism.

As the carriage component selectingmechanism which I now employ so fully appears in the aforementioned patent. it is not deemed necessary to describe the same in great detail. For the present, it will sufiice to state that there are disposed in the letterspacing carriage a plurality of typebar actuating or key-levers, of which some are utilized as numeral-keys to imprint numbers upon the work-sheet, in whatever form the latter may be. In Fig. 2, two of these numeral-keys 5, 5, are shown as exemplifications of the parts constituting such numeralkeys and, through interposed mechanism, now to be described, these several numeralkeys are connected to a plunger 6 which is adapted successively to engage a series of selectors or selecting-levers 7 disposed in the casing 1, and which plunger is adapted to be reciprocated on each stroke of a numeralkey as the letter-spacing carriage travels laterally across the printing-surface and in juxtaposition to said selecting-levers 7. This plunger 6 is adapted to have imparted to it a differential movement whereby a differential actuation of the selecting-mechanism of the calculator is effected. To this end, there are j ournaled in suitable brackets on the top-plate of the letter-spacing carriage, plunger-operating shafts 8, 8, to the inner ends of which are fixed arms 9, 10. Pivoted to these arms are links 11, 12, respectively, and to these is connected a bellcrank-structure preferably comprising arms 13, let, an interposed sleeve 15, and a pendant link lfi. Brackets 17, 18 are provided for supporting said plunger-operating shafts 8, 8, and, also, said bell-crank-structure. The pendant arm or link 16 is provided at its lower end with an elongated slot 19 forming a loose connection with a slide 20, said elongated slot in the link 16 permitting it to have a swinging movement and allowing a straight movement of the slide 20.

The plunger 6 is preferably pivoted to swing on a vertical axis in one direction only, and is held against movement in the other direction by an upstanding pin 21, a spring (not shown) acting against the opposite side of the plunger to hold it against said pin. This permits a slight shifting movement of the plunger in a direction opposite to that of the normal travel of the letter-spacing carriage so that, in the event that the escapement mechanism (not shown) should operate to move the carriage before the plunger has been fully returned to normal position, the plunger will have a slight yielding movement when it strikes one or another of the levers 7 in the computer and, therefore, permit free travel of the carriage without binding and without danger of bending or breaking of the parts.

Fixed upon the plunger-operating shafts 8, 8, are arms 22; and, adjacent to each of these arms is a second arm 23 which is loose upon the shaft, and carries a lug 24 into which is threaded an adjusting screw 25 adapted to bear upon the upper edge of the fixed arm 22.

It will be understood that the downward movement of any particular arm 23 will,

through the interposed parts 24 and 25,

actuate the fixed arm 22 and thereby rock the shaft 8. The adjusting screw 25 affords a means for adjusting the extent of rocking movement of the shaft 8 when the arm 23 is actuated to move the arm 22.

Pivotally pendant from each of the arms 23 is a turn-buckle 26 having an elongated slot 27 in its lower portion and having, at the bottom of the slot, a stop 28 adjustable on said turn-buckle to vary the size of the slot 27. Into the slot 27 projects a pin or stud 5 carried by the key-lever which is adapted to actuate that particular part of the mechanism. There are as many turnbuckles as there are numeral-keys, namely, nine and, therefore, the slots are, as shown particularly in Fig. 3, all of different lengths, that for key No. 9 being the shortest, that for key No. 1 being the longest, and the others varying regularly and successively between these elements. It will be understood, therefore, that as the slot for key No. 1 is long, this particular key-lever may move down a considerable distance before its pin or stud engages in the bottom of the slot in its respective turnbuckle; and, by this arrangement, the extent of movement of the turn-buckle is comparatively slight; whereas, in the case of keylever No. 9, the slot in the turn-buckle being short, there is comparatively little lost motion and a corresponding increase in the extent of movement of the turn-buckle. The movement of any one of the turn-buckles being communicated, through the arms 22 and 23, to the aforementioned arms, rocks the plunger-operating shaft 8 and, this in turn, through the described bell-crankstructure, actuates the plunger 6, and to a distance corresponding with the extent of movement of the rock-shaft 8 which, as already described, is primarily determined, so far as concerns its extent of movement, by the length of the slots 27 in the turnbuckles 26. Inasmuch as the plunger 6 is the means for moving each of the selectinglevers 7 to position the computer-component selecting-mechanism (presently to be described) in the computer for engagement and actuation for operating the denominational-wheels of the computer, to produce a computation, the different selecting-levers 7 will be moved greater or lesser distances, respectively, and the selecting-devices be ac cordingly positioned; in correspondence with the extent of movement of the rock shaft 8.

It will be understood that, by reason of the particular manner of arranging the arms 22 and 23, only that arm 23 which is actuated by its particular key-lever is depressed by the operator. All of the other arms 22 will be rocked away from their respective adjusting screws 25 without, at the same time, efiecting any movement of its proximate arm 23. In this way, none of the other key-levers are actuated when any one particular key is depressed by the operator, as would be the case if the arms 22 and 23 were connected together, or if the turnbuckles 26 were connected to a single arm fast on the rock-shaft. It will be understood that the actuation of the plunger 6 impinges it against the projecting end 7 of one or another of the selecting-levers 7, whereby the latter are reciprocated for a purpose presently to be described. As a means for positively controllingthe exact extent of movement of a selecting-lever 7 and to prevent any overthrow movement thereof, means are provided for temporarily effecting an interlocking of the selectivelever 7 to the plunger 6. To this end, a

springcontrolled latch 29 is pivoted at the outer end of the slide 20 and carries a stud 29 adapted to be engaged by a vertical oscillating member 30 carried and actuated by a link 31 forming a part of a structure of the machine adapted to oscillate upon each depression of, and be controlled in its actuation by, one or another of the keylevers. The latch 29, when engaged and raised by the member 30 engages back of a lug 7* depending from the enlarged end 7 of the selecting-lever 7 and, when interlocked therewith, prevents inaccurate or excessive movement of the engaged selectinglever 7. It is to be understood of'course that this latch moves along as the letterspacing carriage travels, and acts in the same manner, successively, on each of the different selecting-levers 7 after each spacing movement of said carriage takes place.

To restore the parts already described to normal position, a retractile spring 32 is provided and connects, at one end, with a stud. 33 depending from the lower face of the top-plate e and, at its other end, to a stud 34 depending from the lower face of the slide 20. Under the influence of this spring 32, the plunger is returned to starting position immediately after the latch 29 disengages from the lever 7 and, as the slide is being returned to its normal position, it actuates the parts which connect therewith and restores them to normal position. Pivotally mounted at one end of the link 31 is an upwardlyextending lever 35 angulated at its upper end to provide a horizontally-extending member 36 which, on its lower surface, is provided with a plurality of teeth or serrations 37 (preferably eight) adapted to engage with a stud 38 projecting from the side of the slide 20 and having an angular upper edge, as shown in Fig. 2. When the link 31 moves downwardly, it operates, through the lever 35, to lock the angulated member 36 into holding engagement with the stud 38, and this prevents excessive forward move- 1' ment of the entire selecting-mechanism.

The parts are so positioned and related that, upon the downward movement of said angulated member 36, for numeral-key l, for instance, the stud 38 will be held by the first of the teeth or serrations 37; and for numeral-key No. 2, by the second tooth, and so on. As the action of the link 31 is always the same, the said member 36 will always have the same in vement, insuring accurate stopping movement of the selecting-mechanism at the proper point to accord with the numeral being selected. Although the movement of said angulatecl member 36 is always the same, as stated, it is to be noted that while is is moving into its engaging position, the plunger 6 has a differential movement for the different keys, namely, a distance of one increment for key No. 1, two increments for key No. 2, and so on, which differential movement is effected by the mechanism already described. It will be noted that there are only eight teeth on the number 36 because it is never essential to prevent excessive movement when key N0. 9 is depressed, because this will. always properly actuate its adjunctive parts to the limit of their movement. When writing at normal speed, it would generally be unnecessary to provide the locking instrumentalities just described; but, where the typewriter is being rapidly operated, there is a tendency toward excessive movement of the parts by reason of a natural overthrow tendency thereof, and, also, to take up any loose movement that might occur by reason of wear of the parts, etc.

The structure described forms one part of the selecting-mechanism of the computer, and as already specified, is the carriagecomponent of such selecting-mechanismand this part is supported by and travels with the carriage upon which it is mounted. The part of said selecting-mechanism (including the selecting-lever 7) already referred to as the computer-component thereof, is mounted in and housed by the casing 1; and I will now proceed with a description of this under the heading of 2. Computer-component selecting-mecha- This selecting-mechanism, within the easing, is the same for each denominationalwheel or dial, a plurality of which are shown in the present embodiment. A. description of selecting-mechanism for one denominational-wheel will, of course, surlice for all: The selector or selecting-lever 7 by which the parts are selected for actuation, comprises, as shown, an elongated member supported in brackets 39 secured in the lower part of the casing 1. Attached, by a pin-and-slot connection 40 to the selectinglever 7, at its forward end, is an elongated oscillating segment-plate il loosely mounted upon a shaft 12 and provided on its upper edge with teeth 43 adapted to mesh with a pinion 44 loosely mounted on a shaft 5L5, adapted to perform functions presently to be explained. At this stage, it will suffice to say that, when the selecting-lever 7, un der the influence of the plunger 6, is actuated in the direction indicated by the arrow (Fig. 5), the seg1nent-plate L1 will be rocked on its axis and effect a partial rotation of said pinion 44, whereupon it comes to rest and remainsin this position until restored to normal position by the segmentplate 11 when it, itself, is returned to starting position in a manner presently to be described.

The segment-plate is provided with a footextension 46 which is preferably bifurcated to support an anti-friction rolling-element 417.

Normally, the segment-plate 11 occupies the position shown in Fig. 5. When the selecting-lever 7 is actuated in the manner described, the plate -11 is shifted to the position shown in Fig. 4t or to any predetermined intermediate position, according to the selection effected by the selecting-mechanism, already referred to. To the end that the shifting movement of the plate 11 shall be limited, in both directions, I provide a bar 18 extending between the sides 1 of the casing 1, and adapted to be engaged by a curved recess 19 formed in the right-hand edge of the plate 11. At the opposite edge,

:1 the plate 41 is similarly formed with a curved recess adapted to engage a shaft 51, as shown in Fig. 4. By these means, the extent of rotation of the piniond-l is posi tively controlled, and th s is essential to secure accuracy in this structure, because the extent of rotation of said pinion as controls the extent of rotation of a larger pinion 52 which is, like the pinion 44, loose on the shaft 15. Both pinions 4-2-1 and 52 are adapted to have only a partial turn, whereupon their rotation is, in a manner presently to be explained, reversed and they are then rotated back to starting position.

The parts and devices just described constitute, as heretofore stated, the second component of the selecting-mechanism, and their position determines the extent of actuation of the parts, forthwith to be described, which operate to effect the computation, and which I shall now describe under the third heading, already. designated, of

3. Computing mechanism.

Under this heading, I shall first describe the mechanisms for positioning the parts whereby they are adapted to effect a computation either by addition or subtraction, or rendered neutral whereby non-production of a computation results:

The mechanism for predetermining the character of computation includes, by preference, a single mechanism, under the control of the operator, and, in one aspect of the invention, includes, among other elements, two plates 53, 53, disposed at opposite sides of the casing 1 and connected together by a bar 54:, in which stub-shafts 55 are disposed, at its opposite ends, and suitably journaled in the sides of the casing. Each of the plates 53, at its upper curved periphery, is provided with teeth 56 with which meshes a cam-disk 57. Embracing the opposite sides of the cam-disk 57 are two shifting plates 58, There are two of these plates 58, one at each side of the casing and these are connected, at their rear ends, by a cross-bar 59 and fulcrumed at 60 on the sides 1 of the casing 1. Similarly, the plates 59 are connected at their rear ends by a crossbar 61 and are pivoted at 62 upon the sides of the casing. The inner ends of the plates 58 and 59 are provided with inwardly-extending noses 58, 59 which are adapted to ride upon'the untoothed portion of the periphery of the camdisk 57 at opposite sides of its axis and alternately travel upon the cam surfaces 57 and 57", respectively. The noses 58 and 59 are held against the periphery of the camdisk 57 by a spring 60, as shown. As will be seen by referring particularly to Figs. 7 to 11, the positions of the cam-disks 57 are controlled by the oscillating plates 58, when the same are moved on their horizontal axes.

Pivoted on an extension 68 of each of the oscillating plates 53 is a detent member 6a which, at its sides, is provided with outstanding lugs 65, 65. The two detents are connected by a cross-piece 64*" whereby they are actuated together. Secured to, but spaced from, the inside wall of the casing is an arclrshaped guide member 66. The detent-member 61 is adapted to slide along the inner face of the guide member 66. The lower periphery 66 of the member 66 is prox'ided, centrally, with a recess or indentation 67 in which one or another of the lugs is adapted to engage, as shown for instance in Fig. 8, and by which means the de tent member 6 1- and, thus, the plates 53 are adapted to be temporarily held against movement. Suitably mounted upon the lefthand plate 53 is an indicating plate 68 which bears the designation Sub. to indicate subtraction; also N. P. to indicate non-producing; and, also, Add. to indicate addition. The plate 68, which is preferably curved, as shown, is adapted to be shifted by the plate 58 to position one or another of said designations in register with an elongated opening 69 in the front plate 1" of the casing 1, (Fig. 1) and whereby the operator has, within the line of vision, an indicator to enable her to determine whether the parts of the calculating machine are set to effect a computation by subtraction, or by addition, or occupy a neutral position whereby no computation can be produced. In Figs. 9 10 and 11, the three possible positions of the parts which predetermine the character of computation to be efiected are disclosed: In Fig. 9, the mechanism is set for subtraction; and, in this instance, the upper lug on the detent 6 f occupies the recess 67 in the guide-bracket 66. In moving the detent 64 to position the upper lug 65 in the recess 67, the oscillating plates 53 are rocked on their axes and thereby rotate the cam-disks 57 to position the nose 59 of the pawl 59 in the cam-depression 57 The nose-extension 58 of the plate 58 will then occupy a position upon the raised portion of the periphery of the cam-disk 57. When the parts are in the position thus described, they will have positioned other parts. of the structure (presently to be described) to effect computation by subtraction.

In Fig. 10, the parts are shown as occupying the position they assume to effect computation by addition: In this instance, the detent 64 has been moved by the operator backwardly to position the lower lug 65 thereon into the recess 67 in the guide bracket 66; and, in thus positioning these parts, the oscillating plates 53 will have been rocked on their axes and effected a rotation of the cam-disk 57 to position the camdepression 57 opposite the nose-extension 58 of the plate 58 and simultaneously cause the nose-extension 59 to ride upon the raised portion of the cam-periphery of said disk. While these parts are being thus positioned, they will have actuated the other parts of the structure (already referred to as to be described) to effect'a computation by addition.

In Fig. 11, the parts are shown in the position they assume when occupying a neutral position; that is to say, a position which precludes a computation either by subtraction or by addition: In this instance, the detent has been shifted to occupy a central position with relation to the center of the guide-bracket 66 and, thus, the oscillating plates 53 will have rotated the cam-disks 57 so that neither of the plates 58 nor 59 will have their nose-extensions seated in the camdepressions in said cam-disks.

From the foregoing description, it will have been understood that there are two of the plates 53 connected by the bar 54: for unison of action; two of the cam-disks 57 to mesh with the plates 53, and a pair of the plates 58 and 59 disposed at opposite sides of the casing 1 and connected respectively by the cross-bars 59 and 61, respectively, as already described.

As the setting-mechanism above described is entirely independent of the selectingmeans, it follows that it may be operated irrespective of whether a selection has first been made; that is to say, this setting; mechanism may be shifted either before or after a selection by the selectinganechanism has been effected.

It will now be in order to describe the parts affected by the positioning of the plates 58 and 59, since these are the elements, in conjunction with those already described, which control the character of the computation to be effected by the machine, and it may be here stated that there will be a complete set of these parts, now to be described, for each of the series of numberwheels or dials employed in the machine:

Arranged in juxtaposition to the plates 58 and 59, and lying in a plane parallel therewith, is a pawl-carrying plate 70 provided with a central elongated slot 71 through which projects a crossbar 72 constituting a support for each of the series of these plates 70. On opposite edges of the plates 70, extensions 70 and 7 0 are formed to provide a support for oppositely-disposed pawls 73 and 74. These pawls 73 and 7d are provided, beyond their fulcrums 7 3 and 74 with engaging portions 78 and 7 3, which are arranged in the path of movement of the cross-bars 59 and 61, respectively, which connect the respective pairs of the plates 58 and 59, already described. WVhen, therefore, the plates 58, for instance, are rocked on their fulcruins (30, the bar 59 will engage the extensions 73 of the pawls 73 and actuate them. imilarly, when the plates 59 are rocked on their fulerums 62, the cross-bar 61 is positioned to engage and move the engaging extension 74 of the pawl 74 to actuate them.

The elements affected by the actuation of these parts will now be described:

Supported upon a transverse shaft 75 are a series of gears 76 adapted to mesh with and control geared number-wheels or dials 77 supported on a transverse shaft 78 arranged in parallelism with the shaft 75. Rigidly connected to each of the gears 7 6 is a toothed or ratchet ring or wheel 79, and with this the pawls 73 and 7d, already described, are adapted to coact and control the direction of rotation, first, of said ratchetwheels and, thereby, of the gear-wheels and, through these, of the number-wheels or dials 77. To perform the functions presently to be explained, it will be understood that the gear 7 (3 and number-wheel 77 are loose on their respective shafts. fln the side of the gear 76, opposite to that to which the ratchet-wheel 79 is attached, is secured a starwheel or toothed disk 80, the function of which will forthwith be set forth.

Having thus described the manner in which the direction of rotation of the gears 7 6, and, through these, of the number-wheels 77, is controlled, a description of the mecha nism interposed between the pinions 52, already described, and said gears 76, whereby the latter are actuated, will indicate the coaction between these several structures of the machine: Arranged in juxtaposition and in parallelism with the faces of each of the gears 76 and the pinions f 2 is a pinion-carrying member 81, which, at its upper end, is fulcrumed on the shaft 7 5 which, as already stated, supports the gears 76. Rotatably mounted on the left-hand lower portion of theplate 81 is a single pinion 82 which, as shown, is adapted to mesh constantly with the gear 76 and alter nately with the pinion 52. Similarly mounted at the opposite, right-hand portion of the member 81 are two smaller gears 83, 84 arranged constantly to mesh with each other, and with the gear 7 6, and alternately with the actuating pinion 52, and be thereby driven to eflect a rotation of the gear 76 when positioned in mesh therewith. The plate 81 is adapted to be rocked 'on its fulcrum (the shaft alternately to position the gear 82 in mesh with the pinion 52, and the pinion 83 in mesh with pinion 52. WVhichever of these pinions, namely 82, on the one side, or 83, on the other side, is in mesh with the pinion 52, will determine in which direction the, gear 7 6 will be rotated. As already explained, the plate 81 is shiftable to position the respective pinions alternately in engagement with the pinion 52. The shifting of the plate 81 is effected synchronously with the actuation of the pawls 7 3 or 74 into holding engagement with the ratchet-wheel 7 9, as already described. This synchronous movement of the plate 81 is primarily controlled by the setting detent 64 and the oscillating plates 53 by reason of the connection therewith of the following parts:

Extending transversely between the plates 53 is the bar 54:, already described, and which also occupies a position between two spaced jaw-members 86 and 87 which are fulcrumed at their lower ends, and connected intermediate of their ends by a retractile spring 88, the action of which is to draw the two jaw-members toward each other. The outer ends of these jaw-members 86 and 87 are adapted to engage, both together or alternately, a boss 89 formed on one face of the pinion-carrying member 81. When the setting-lever is in the position shown in Fig. 11, that is, the non-producing position, the jaw-members will both be in engagement with said boss. When, however, said setting detent is shifted to position the parts for subtraction, for instance, the bar connecting the plates 53 will move the jawmember 86 away from the boss 89, as shown in Fig. 4. By this operation, the spring 88 is tensioned and tends to force the jawmember 87 against the boss 89. Under this influence, the pinion-carrying member 81 will be caused to shift on its fulcrum and position the pinion 82 into mesh with the pinion 52. If both jaw-members 86 and 87 are in engagement with the boss 89, the spring 88 remains unfleXed and, therefore, there is no influence working upon the plate 81 to change its position, wherefore both sets of pinions on the plate 81 are held out of mesh with the pinion 52.

It must be stated, at this stage, that the initial positioning of one or another of the jaw-members 86 or 87 away from the boss on the member 81 to produce a tension upon the retractile spring 88 in order that it may, under the influence of this spring, shift the member 81, does not, in and by itself, effect a shifting of said member 81, because said member 81 acts also under the influence of another set of parts, now to be explained:

For each of the series, already referred to, a cam-disk 90 is supported upon a transverse shaft 91 and is provided with a camgroove 92 formed in the face of said camdisk 90. For the most part, said cam-groove is circular. As appears in Figs. 4;, 5 and 6, the cam groove is, at one portion, widened to provide an outer cam-surface 93 and an inner cam-surface 94-. In this cam-groove 92 a stud 81, secured in one face of the lower limb 81 of the pinion-carrying member 81, is adapted to travel and, according to whether it is moving in the circumferential portion of the cam-groove, or against one or another of the camsurfaces 93, 9-1, the position of said pinion-carrying member 81 is afiected. The outermost cam-disks 90 are provided on their outer faces with gear-sew tions, with which mesh pinions 95 rotating on stub-shafts 96. Arranged in juxtaposition to the pinion 95 is a rotatable actuating element, which, in this instance includes a shaft 97 and plurality of cammed extensions 98 mounted thereon, each successive extension radiating from the body-portion of the element in a relatively different direction, as clearly appears in Fig. 1, and for reasons presently to be explained. At the extremities of said actuating element are pinions 99 (Fig. P) adapted to mesh with the pinions 95, the rotation of which is effected by the cam-disks 90. It will now be understood that the rotation of the cam-disks 90 will turn the pinions 95 and thereby rotate the actuating-elements including shaft, cams 98, etc, 97 and, simultaneously, the stud 81 carried by the pinion-carrying plate 81 will be caused to traverse the cam-groove 92. lVhile said stud is traveling in the circular portion of the groove, the plate 81 is held stationary temporarily. When, however, said stud arrives at the enlarged portion of the groove, it will be caused to travel on either the cam-surface 93 or the cam-surface 94, according to which of the jaw-members 86, 87 is in ngagement with the boss 89. For instance, and referring to Fig. 4:, the jaw-member 87 by pressing against the boss 89 is adapted to effect a shifting of the member 81 the moment the stud 81 reaches the enlarged portion of the cam-groove and, under the influence of the spring 88, said member 81 is pulled toward the left and caused to travel upon the cam-surface 93. While thus traversing "this cam-surface 93, the member 81 will shift toward the left and position the pinion 88 in mesh with the actuating pinion which, by rotating in a counterclockwise direction turns the pinion 83 in a clockwise direction and this in turn, by meshing with its companion pinion 8% turns it in a counterclockwise direction, whereby the gear 76 is caused to rotate in a clockwise direction, and thereby effect a counterclockwise rotation of the number-wheel 77. These movements of the described parts will have operated to effect a computation by subtraction. If, however, the setting detent (34: is shifted to a position that will bring the portion of the indicator plate 68, bearing the designation Add, into register with the opening 69, and whereby the oscillating plates 53 are shifted baekwardly to actuate the parts into the position illustrated in Fig. 10,where in the pawl 73 is in holding engagement with the ratchet-wheel 7 9 and the pawl 74 is out of engagement therewithand the jaw-member 87 be shifted away from the boss 89 whereby to cause the spring 88 to pull the jaw-member 86 into engagement with said. boss 89, the gear-carrying plate 81 is then brought into readiness to be shifted toward the right when the stud 81* passes from the circular portion of the cam-groove 92 into the enlarged p rtion thereof and into engagement with the inner cam-surface 94. This movement will have shifted the companion gears 83 and 84 beyond the control of the actuating gear and moved the other gear 82 into mesh with said actuating gear 52. The pinions, whichever is in mesh with the actuating pinion 52, will be held in engagement therewith until the stud 81 travels off the cam-surfa ce-whether it be 93 or 94and into the circular portion, whereupon said pinion will be disengaged from the pinion WVhile in engagement therewith, however. they will. have performed their function of actuating the gear 76, and, thereby, the nu1nherwheel 77.

In describing the cycle of movement of the parts, when the machine is set for subtraction, the direction of rotation of the gear 76 and the number-wheel 77 was explained. It will be understood. now, that when the structure is set for addition, the gear 76 and the number-wheel 77 will be actuated in the opposite directions from those specifie naru y the gear 76 will be turned in a clockwise direction and effect a counterclockwise rotation of the numberwheel.

The segment plate 41 has already been de scribed as constituting an element of the comp Liter-component selecting-mechani sm of the construction. As it is in constant mesh with the pinion at, which is secured to the actuating pinion 52, said member &1 becomes an actuating connection between the actuating element 97 and said actuating pinion That is to say, when the actuating element 97 is rotated, and the extension 98 is adapted to engage the roller a7 on the foot-extension 16 of said plate 41 to move the same on its axis 12 and, in this way, through the geared portion 4:3 thereof, the pinions 4.4: and 52, are rotated to drive either the pinion 82 or the companion pinions S3 and Set, and through one or the other of these to rotate the gear 76 and, thereby, effect a predetermined rotation of the number-wheel 77. It will have been understood that when the selecting-lever '7 is actuated, in the manner already described, the shifting plate i]. is actuated to e'li'ect rotation of the pinion 52. At this stage of the operation, neither the pinion 82 nor the companion pinions 83 and 84: are in mesh with said pinion 52, so that the same is rotated without effecting actuation of any part. 'When, however, said plate 41 is about to be moved on its axis by the actuating element 97, the pinion-carrying plate 81.. acting under the control of the cam wheel 90, will have been moved on its axis 75 to position either the pinion 82 or the pinion S3 in mesh with the pinion 52, according to whether the structure has been set to effect computation by subtraction or by addition. Therefore, by the time the extension 98 of the actuating element 97 has reached a position to engage the roller-provided foot-extension 46 of the member 4-1, one or the other of said pinions 82 or 83 will be in mesh with the pinion whereupon, during a continued movement of the element 97, said member 41 will be shifted in a direction opposite to that it followed when under the control of the selecting-lever 7; whereby. in the first place, said member 41 and the selecting-lever 7 will have been restored to normal position and, simultaneously therewith, the pinion 52 will have been rotated and, through either the pinion 82, or the companion pinions 83 and 8t, effect a rotation of the gear 76 and. thereby, of the number-wheel 77. The degree of movement of the member 41, under the control of the selecting-lever 7-and this lever having been moved a predetermined dista nce, has determined. whichever of the numberre vs has been depressed by the operatorwill have predetermined the extent of movement of the member 41 and, thus, of the pinion 52 and, as this predetermines the extent of rotation of the gear 76, the number-- wheel 77 will have been rotated to position the number or index thereon corresponding with the number imprinted upon the worksheet. In. other words, if, as illustrated in Fig. 1, the nu1nberkey 9 has been depressed for actuating the plunger 6 to shift the selooting-lever 7 a distance equal to nine spaces, the member 41 will similarly have been moved so as to position the pinion 52 in order that it, through either the pinion 82, or the companion pinions 83 and 84, will rotate the gear 76 a distance equal to said nine spaces (as fixed by the teeth thereon), and thereby rotate the number-wheel so as to position it to exhibit the figure 9 through the opening in the front plate 1 of the easing 1. If, however, the No. 5 numeral-key is the one which has been depressed, the selecting-lever 7 will have been moved a distance equal to five spaces, with a corresponding actuation of the parts between it and the numberwheel, so that said numberwheel will exhibit the figure 5. And so it will be in the instance of whichever numberkey is depressed.

The driving-mechanism for the actuating instrumentalities 97 includes the pinions 95, the geared cam-disks 90, and the shaft 91. The latter extends through the casing 1 and carries on its outer end a pinion 102 (Fig. 1) with which meshes a large gear 103 supported on a stud 101 mounted on the outside of the casing of the computer, as shown. To this gear 103 is secured a four-tooth ratchet-wheel 104: adapted to be actuated by a spring-pressed pawl 105 carried by a circular disk 106. Said disk is provided on its lower periphery with gear teeth 107 adapted to mesh with a toothed arm 108 which is fulcrumed at 108 on the side of the casing 1 and to which is secured an operating hand-lever 109. The toothed arm is limited in its movement in one direction by a stopstud 108 outstanding from the side of the casing as shown in Fig. 1 and this holds the other a'djunctive parts against retrograde movement. To hold the parts against movement in the opposite direction, except as controlled by the lever 109, the pinion 102 is provided with an outstanding stud 102 which is adapted to engage against the periphery of a disk 110 secured to the disk 106. As seen in Fig. 1, this disk is provided with a clearance incut 111 in one portion of its periphery, and into this the stud 102 will (as the pinion 102 begins its rotative movement) travel and thereby permit said pinion to complete its rotation. TVhen said pinion is inactive it will engage the shoulder 111 and prevent movement of the pinion. From this it will be understood that when the lever 109 is pulled forward by the operator, the arm 108 gives the toothed disk 1.00 a rotative movement and this, in turn, produces movement of the disk 100 which, then, aetuates the pawl 105 against one or another of the teeth on the toothed wheel 104: and this communicates rotative move ment to the gear 103 which, itself, then effects a rotation of the pinion 102, whereby the shaft 91 is rotated (always in the same direction), and makes a complete revolution each time that the hand-lever 109 is operated. It will therefore he understood that the handle, the disks I 100 and 110, the toothed wheel 10%, gear 103, pinion 109., shaft 91, etc., constitute a driving or actnat ing mechanism which I shall herein designate the independent operating mechanism consisting, in this instance, of the cammed members 97.

In Fig. 4, the member 11 is shown in the position it occupies after being actuated by the selecting-lever 7. In this instance, the companion members 83 and St ha re. by the movement of the pinion-carrying plate 81, been shifted into mesh with the pinion 52, and the shaft 91 and the disks 90 turned slightly, so that, if the operator were, at this stage, to pull the hand-lever 109 forward to rotate the shaft 91, the canm'ied extension on the member 97 would rock the member 11 upon its axis 42 and thereby restore it to normal position and simultaneously rotate the pinion pinions S3 and 8 1-, gear 76, and number wheel 77, whereby the pa it? will then have become positioned as illustrated in Fig. 5, and, as the structure is set to effect computation by subtraction. in this instance, the said number-wheel 77 will have been rotated in a counterclockwise direction. Had the setting lever 6 been shifted to set the parts to effect computation by ad dition, the pinion 82 would have been positioned in mesh with the pinion and offected a rotative movement of the numberwheel in a clockwise direction and thereby the parts would have been actuated to effect a computation by addition. If, on the other hand, the setting lever had been set to non-producing position, as already described, neither the pinion 82- nor the pinion 83 would have been positioned in mesh with the pinion 52. It follows, therefore, that the actuation of the hand-lever 109 to move the actuating element 97 would merely have caused the plate 11 to be returned to normal position and, in the course of its trave would have rotated the pinion 52 without effecting the operation of either of the other pinions, for the reason that neither of these pinions would then be in mesh therewith. This non-producing feature of the machine is an important one because it enables the elements of the computer-component selecting-mechanism to be restored to normal or starting positionto correct a mistake 1 ill) 

